Strap for Fifty Fathoms Bathyscaphe Stainless Steel / Grey / Sand Nato

The lug width (also called ansa width) of the Blancpain Fifty Fathoms 5000-1110-NAKA is 23 millimetres. This measurement represents the space between the two spring bars that support the strap and corresponds to the inner width of the case at the lug position. To verify this, examine the space between the lugs where the spring bars insert: it must be exactly 23mm to ensure correct strap fitment.

The ideal strap depends on intended use. For formal elegance, choose alligator in black or deep blue with contrasting stitching. For natural patina and environmental consciousness, vegetable-tanned calf in cognac or chocolate brown develops character over time. For genuine diving purposes, black rubber or NATO polyamide straps offer maximum practicality and water resistance. Shell cordovan is also an exclusive option for those seeking legendary durability and natural lustre.

The procedure is straightforward. Obtain a spring bar removal tool or consult a professional watchmaker. Locate the two lateral spring bars passing through the lugs: by gently pressing one bar with the tool, you can extract it and release the old strap. Insert the new 23mm strap by aligning it with the lugs, reinsert the spring bar, and press until it clicks into place. Repeat for the opposite side. If unsure, entrust the operation to a specialist.

All straps with a 23mm lug width are compatible with the 5000-1110-NAKA. The market offers options in alligator, crocodile, calf leather, shell cordovan, rubber, nubuck, NATO canvas and nylon. Milano Straps provides a curated selection of bespoke 23mm straps in various materials and finishes, allowing you to choose thickness, colour, and buckle type (standard deployante or customised options).

A quality leather strap, crafted from vegetable-tanned or authentic alligator leather, typically lasts between 3 and 7 years depending on frequency of wear and environmental exposure. If you wear the watch daily and expose it to perspiration, saltwater or intense UV radiation, longevity decreases. A rubber or NATO strap resists longer in marine environments. Milano Straps artisanal straps include an 18-month warranty against manufacturing defects and can be easily renewed or replaced thanks to the standard spring bar system.